MOBILE, Alabama -- The Mobile Fire-Rescue Department is investigating an early morning fire at a vacant home in west Mobile that left two injured.

Firefighters were dispatched to the house at 313 Lincoln Blvd. shortly before 4 a.m. where they found the flames coming from the roof of the wood frame building.

A search of the house revealed no one inside, Fire-Rescue officials said in a press release.

Two firefighters were injured while fighting the blaze when what is believed to have been a heavy wooden object fell from the attic, striking Fire Captain Clay Lyons on the head. Lyons was knocked to the ground where he landed on a large screen television.

A heavy object also fell on the foot of firefighter Pat Henderson. Both men were taken to Springhill Medical Center to be treated for their injuries. Henderson was later released, but Lyons was still under observation, officials said.

Firefighters were told the building has been vacant for as many as 6 months, but served as a storage space for one of the owners who was last seen visiting the house the evening before.

Fire-Rescue officials said they do not suspect anything suspicious at this time.

The fire may have started in a bedroom toward the front of the house and then spread through the attic and roof. No utilities were servicing the house at the time, officials said. Fire and smoke damage to the property is estimated at $50,000.